Possible strong electron-lattice interaction and giant magneto-elastic effects in Fe-pnictides
| dc.creator | Kulic, Miodrag L. | |
| dc.creator | Haghighirad, Amir A. | |
| dc.date | 2009-04-22 | |
| dc.date | 2009-05-02 | |
| dc.date.accessioned | 2026-07-07T13:10:44Z | |
| dc.date.available | 2026-07-07T13:10:44Z | |
| dc.description | The possibility for an appreciable many-body contribution to the electron-phonon interaction (EPI) in Fe-pnictides is discussed in the model where EPI is due to the electronic polarization of As- ions. The EPI-pol coupling ismuch larger than the one obtained in the LDA band structure calculations. It contributes significantly to the intra-band s-wave pairing and an appreciable positive As-isotope effect in the superconducting critical temperature is expected. In the Fe-breathing mode the linear (in the Fe-displacements) EPI-pol coupling vanishes, while the non-linear (quadratic) one is very strong. The part of the EPI-pol coupling, which is due to the "potential" energy (the Hubbard U) changes, is responsible for the giant magneto-elastic effects in MFe_{2}As_{2}, M=Ca, Sr, Ba since it gives much larger contribution to the magnetic pressure than the band structure effects do. This mechanism is contrary to the LDA prediction where the magneto-elastic effects are due to the "kinetic" energy effects, i.e. the changes in the density of states by the magneto-elastic effects. The proposed $EPI-pol is expected to be operative (and strong) in other Fe-based superconductors with electronically polarizable ions such as Se, Te, S etc., and in high-temperature superconductors due to the polarizability of the O-ions. | |
| dc.description | 6 pages, 2 figures; new References are added, text improved, typos corrected | |
| dc.identifier | https://arxiv.org/abs/0904.3512 | |
| dc.identifier | http://arxiv.org/abs/0904.3512 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/229085 | |
| dc.subject | Superconductivity | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Possible strong electron-lattice interaction and giant magneto-elastic effects in Fe-pnictides | |
| dc.type | text |